F-Test is designed to indicate whether there is a significant difference between two methods based on their standard deviations. The following results were obtained during the Gravimetric and Volumetric determination of iron in sample A.
Gravimetric: 13.0, 13.5, 13.3, and 12.9.
Volumetric: 15.1, 13.3, 12.7, 12.6, and 13.1.
From the following two sets of replicate analyses on the same sample, determine whether the variance of gravimetric differs significantly from that of the volumetric method.